﻿// -------------------------------------------------------------------------
//    @FileName         :    NFMD5.cpp
//    @Author           :    Gao.Yi
//    @Date             :   2022-09-18
//    @Email			:    445267987@qq.com
//    @Module           :    NFCore
//
// -------------------------------------------------------------------------

#include "NFMD5.h"
#include <iostream>
#include <string.h>


#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))


unsigned char NFMD5::PADDING[64] =
{
	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

void NFMD5::md5init(MD5_CTX *context)
{
	context->count[0] = context->count[1] = 0;
	context->state[0] = 0x67452301;    /* load magic initialization constants.*/
	context->state[1] = 0xefcdab89;
	context->state[2] = 0x98badcfe;
	context->state[3] = 0x10325476;
}

void NFMD5::md5_process(MD5_CTX *ctx, const unsigned char data[64])
{
	unsigned long X[16], A, B, C, D;

	GET_ULONG_LE(X[0], data, 0);
	GET_ULONG_LE(X[1], data, 4);
	GET_ULONG_LE(X[2], data, 8);
	GET_ULONG_LE(X[3], data, 12);
	GET_ULONG_LE(X[4], data, 16);
	GET_ULONG_LE(X[5], data, 20);
	GET_ULONG_LE(X[6], data, 24);
	GET_ULONG_LE(X[7], data, 28);
	GET_ULONG_LE(X[8], data, 32);
	GET_ULONG_LE(X[9], data, 36);
	GET_ULONG_LE(X[10], data, 40);
	GET_ULONG_LE(X[11], data, 44);
	GET_ULONG_LE(X[12], data, 48);
	GET_ULONG_LE(X[13], data, 52);
	GET_ULONG_LE(X[14], data, 56);
	GET_ULONG_LE(X[15], data, 60);

#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))

#define P(a,b,c,d,k,s,t)                                \
{                                                       \
    a += F(b,c,d) + X[k] + t; a = S(a,s) + b;           \
}

	A = ctx->state[0];
	B = ctx->state[1];
	C = ctx->state[2];
	D = ctx->state[3];

#define F(x,y,z) (z ^ (x & (y ^ z)))

	P(A, B, C, D, 0, 7, 0xD76AA478);
	P(D, A, B, C, 1, 12, 0xE8C7B756);
	P(C, D, A, B, 2, 17, 0x242070DB);
	P(B, C, D, A, 3, 22, 0xC1BDCEEE);
	P(A, B, C, D, 4, 7, 0xF57C0FAF);
	P(D, A, B, C, 5, 12, 0x4787C62A);
	P(C, D, A, B, 6, 17, 0xA8304613);
	P(B, C, D, A, 7, 22, 0xFD469501);
	P(A, B, C, D, 8, 7, 0x698098D8);
	P(D, A, B, C, 9, 12, 0x8B44F7AF);
	P(C, D, A, B, 10, 17, 0xFFFF5BB1);
	P(B, C, D, A, 11, 22, 0x895CD7BE);
	P(A, B, C, D, 12, 7, 0x6B901122);
	P(D, A, B, C, 13, 12, 0xFD987193);
	P(C, D, A, B, 14, 17, 0xA679438E);
	P(B, C, D, A, 15, 22, 0x49B40821);

#undef F

#define F(x,y,z) (y ^ (z & (x ^ y)))

	P(A, B, C, D, 1, 5, 0xF61E2562);
	P(D, A, B, C, 6, 9, 0xC040B340);
	P(C, D, A, B, 11, 14, 0x265E5A51);
	P(B, C, D, A, 0, 20, 0xE9B6C7AA);
	P(A, B, C, D, 5, 5, 0xD62F105D);
	P(D, A, B, C, 10, 9, 0x02441453);
	P(C, D, A, B, 15, 14, 0xD8A1E681);
	P(B, C, D, A, 4, 20, 0xE7D3FBC8);
	P(A, B, C, D, 9, 5, 0x21E1CDE6);
	P(D, A, B, C, 14, 9, 0xC33707D6);
	P(C, D, A, B, 3, 14, 0xF4D50D87);
	P(B, C, D, A, 8, 20, 0x455A14ED);
	P(A, B, C, D, 13, 5, 0xA9E3E905);
	P(D, A, B, C, 2, 9, 0xFCEFA3F8);
	P(C, D, A, B, 7, 14, 0x676F02D9);
	P(B, C, D, A, 12, 20, 0x8D2A4C8A);

#undef F

#define F(x,y,z) (x ^ y ^ z)

	P(A, B, C, D, 5, 4, 0xFFFA3942);
	P(D, A, B, C, 8, 11, 0x8771F681);
	P(C, D, A, B, 11, 16, 0x6D9D6122);
	P(B, C, D, A, 14, 23, 0xFDE5380C);
	P(A, B, C, D, 1, 4, 0xA4BEEA44);
	P(D, A, B, C, 4, 11, 0x4BDECFA9);
	P(C, D, A, B, 7, 16, 0xF6BB4B60);
	P(B, C, D, A, 10, 23, 0xBEBFBC70);
	P(A, B, C, D, 13, 4, 0x289B7EC6);
	P(D, A, B, C, 0, 11, 0xEAA127FA);
	P(C, D, A, B, 3, 16, 0xD4EF3085);
	P(B, C, D, A, 6, 23, 0x04881D05);
	P(A, B, C, D, 9, 4, 0xD9D4D039);
	P(D, A, B, C, 12, 11, 0xE6DB99E5);
	P(C, D, A, B, 15, 16, 0x1FA27CF8);
	P(B, C, D, A, 2, 23, 0xC4AC5665);

#undef F

#define F(x,y,z) (y ^ (x | ~z))

	P(A, B, C, D, 0, 6, 0xF4292244);
	P(D, A, B, C, 7, 10, 0x432AFF97);
	P(C, D, A, B, 14, 15, 0xAB9423A7);
	P(B, C, D, A, 5, 21, 0xFC93A039);
	P(A, B, C, D, 12, 6, 0x655B59C3);
	P(D, A, B, C, 3, 10, 0x8F0CCC92);
	P(C, D, A, B, 10, 15, 0xFFEFF47D);
	P(B, C, D, A, 1, 21, 0x85845DD1);
	P(A, B, C, D, 8, 6, 0x6FA87E4F);
	P(D, A, B, C, 15, 10, 0xFE2CE6E0);
	P(C, D, A, B, 6, 15, 0xA3014314);
	P(B, C, D, A, 13, 21, 0x4E0811A1);
	P(A, B, C, D, 4, 6, 0xF7537E82);
	P(D, A, B, C, 11, 10, 0xBD3AF235);
	P(C, D, A, B, 2, 15, 0x2AD7D2BB);
	P(B, C, D, A, 9, 21, 0xEB86D391);

#undef F

	ctx->state[0] += A;
	ctx->state[1] += B;
	ctx->state[2] += C;
	ctx->state[3] += D;
}

std::string NFMD5::md5file(const std::string& fileFullName)
{
	unsigned char sOutBuffer[16];
	unsigned char buf[1024];
	FILE *f;
	size_t n;
	MD5_CTX context;
	if ((f = fopen(fileFullName.c_str(), "rb")) == NULL)
		return "";
	md5init(&context);
	while ((n = fread(buf, 1, sizeof(buf), f)) > 0)
		md5update(&context, buf, (int)n);
	md5final(sOutBuffer, &context);
	fclose(f);
	memset(&context, 0, sizeof(MD5_CTX));
	std::string s((const char *)sOutBuffer, 16);
	return bin2str((const void *)s.data(), s.length(), "");
}

void NFMD5::md5update(MD5_CTX *ctx, unsigned char *input, unsigned int ilen)
{
	unsigned int fill;
	unsigned long left;
	if (ilen <= 0)
		return;
	left = ctx->count[0] & 0x3F;
	fill = 64 - left;
	ctx->count[0] += ilen;
	ctx->count[0] &= 0xFFFFFFFF;
	if (ctx->count[0] < (unsigned long)ilen)
		ctx->count[1]++;
	if (left && ilen >= fill)
	{
		memcpy((void *)(ctx->buffer + left), (void *)input, fill);
		md5_process(ctx, ctx->buffer);
		input += fill;
		ilen -= fill;
		left = 0;
	}
	while (ilen >= 64)
	{
		md5_process(ctx, input);
		input += 64;
		ilen -= 64;
	}
	if (ilen > 0)
	{
		memcpy((void *)(ctx->buffer + left), (void *)input, ilen);
	}
}


void NFMD5::md5final(unsigned char output[16], MD5_CTX *ctx)
{
	unsigned long last, padn;
	unsigned long high, low;
	unsigned char msglen[8];

	high = (ctx->count[0] >> 29)
		| (ctx->count[1] << 3);
	low = (ctx->count[0] << 3);

	PUT_ULONG_LE(low, msglen, 0);
	PUT_ULONG_LE(high, msglen, 4);

	last = ctx->count[0] & 0x3F;
	padn = (last < 56) ? (56 - last) : (120 - last);

	md5update(ctx, (unsigned char *)PADDING, padn);
	md5update(ctx, msglen, 8);

	PUT_ULONG_LE(ctx->state[0], output, 0);
	PUT_ULONG_LE(ctx->state[1], output, 4);
	PUT_ULONG_LE(ctx->state[2], output, 8);
	PUT_ULONG_LE(ctx->state[3], output, 12);
}

void NFMD5::encode(unsigned char *output, UINT4 *input, unsigned int len)
{
	unsigned int i, j;

	for (i = 0, j = 0; j < len; i++, j += 4)
	{
		output[j] = (unsigned char)(input[i] & 0xff);
		output[j + 1] = (unsigned char)((input[i] >> 8) & 0xff);
		output[j + 2] = (unsigned char)((input[i] >> 16) & 0xff);
		output[j + 3] = (unsigned char)((input[i] >> 24) & 0xff);
	}
}

void NFMD5::decode(UINT4 *output, unsigned char *input, unsigned int len)
{
	unsigned int i, j;

	for (i = 0, j = 0; j < len; i++, j += 4)
	{
		output[i] = ((UINT4)input[j])
			| (((UINT4)input[j + 1]) << 8)
			| (((UINT4)input[j + 2]) << 16)
			| (((UINT4)input[j + 3]) << 24);
	}
}

void NFMD5::md5_memcpy(POINTER output, POINTER input, unsigned int len)
{
	unsigned int i;

	for (i = 0; i < len; i++)
	{
		output[i] = input[i];
	}
}

void NFMD5::md5_memset(POINTER output, int value, unsigned int len)
{
	unsigned int i;

	for (i = 0; i < len; i++)
	{
		((char *)output)[i] = (char)value;
	}
}

std::string NFMD5::md5bin(const std::string &sString)
{
	unsigned char sOutBuffer[16];

	MD5_CTX context;
	md5init(&context);
	md5update(&context, (unsigned char*)sString.c_str(), sString.length());
	md5final(sOutBuffer, &context);

	std::string sBinResult;

	sBinResult.assign((const char *)sOutBuffer, 16);

	return sBinResult;
}

std::string NFMD5::md5str(const std::string &sString)
{
	std::string s = md5bin(sString);
	return bin2str((const void *)s.data(), s.length(), "");
}

std::string NFMD5::bin2str(const void *buf, size_t len, const std::string &sSep)
{
	if (buf == NULL || len <= 0)
	{
		return "";
	}

	std::string sOut;
	char sBuf[255];
	const char *p = (const char *)buf;

	for (size_t i = 0; i < len; ++i, ++p)
	{
		snprintf(sBuf, sizeof(sBuf), "%02x%s", (unsigned char)*p, sSep.c_str());
		sOut += sBuf;
	}

	return sOut;
}
